General Definition

Any object in an application created using a computer program rather than created manually using something in the userspace.

GUI Elements

In general, gui elements are declared in static contexts inside their accompanying tags in xml/ html files or in any other derivatives ( xhtml, jsp, jspx, jsf, phtml, and many others).

Programmatically created are those gui elements that are coded in dynamic contexts that need to be compiled to take effect at runtime. They could be created at runtime by a click of a button as an example, where they would be coded inside a click listener for that button.